四川盆地晚二叠世克拉通内裂陷作用背景下的盐亭—潼南海槽沉积充填特征
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摘要
四川盆地晚二叠世经历了克拉通内裂陷作用以及基底断裂活动,在区域大缓坡背景下,形成"三隆三凹"的古地理格局,发育鄂西—城口海槽、开江—梁平海槽以及盐亭—潼南海槽。在区域背景及动力学分析的基础上,利用钻井、露头、地震资料等论证了盐亭—潼南海槽的几何形态,盐亭—潼南海槽发育在川中地区,整体呈北西-南东向近平行于开江—梁平海槽展布,向西北部广海开口,向东南台地区逐渐变浅并与鄂西—城口海槽连通。利用地震、地质结合的方法,探讨了盐亭—潼南海槽的沉积格局,其以细粒沉积为主,地层厚度薄,其西侧磨溪—中江台缘带以发育生屑滩为主,东侧广安—公山庙台缘带以发育生物礁为主;生物礁滩的分布随着海平面变化具有明显的迁移特征,整体上可以分为两期,并逐渐由两侧台缘带向海槽内迁移。盐亭—潼南海槽的形成、发展及消亡主要受勉略洋扩张-收缩的影响;晚二叠世勉略洋扩张期,四川盆地NW向基底断裂活动,导致川中地区正断活动,形成断陷海槽,即盐亭—潼南海槽。
Previous research shows that Sichuan Basin underwent intracratonic rift and basement fault activities in the Late Permian,developing apaleogeographic framework of"three uplifts and three depressions"under the background of the regional large ramp,including Exi-Chengkou trough,Kaijiang-Liangping trough and Yanting-Tongnan trough.Based on geological background and tectonic dynamics analysis and using data of drillings,outcrops and seismos,Yanting-Tongnan trough has been researched in Central Sichuan Basin in our study,which extends in NW-SE nearly paralleling to Kaijiang-Liangping trough,opening to the sea northwestward,and gradually becoming shallower to the east platform and conneted to Exi-Chengkou trough.According to the comprehensive analysis of geology and seismism,sedimentary configuration of YantingTongnan trough has been discussed,which mainly filled with fine grained sediment,and platform margin reef belt distributes around the trough.Organic banks distribute on the west margin of the trough and reefs on the east margin of the trough.The formation,evolution,filling and extinction processes of the Yanting-Tongnan trough was controlled by the expansion of Mianlüe ancient ocean;in the extensional tectonic environment,due to Emei Taphrogenesis,the NW basement faulting inside Sichuan Basin caused tenso-shear activities and thus resulted in tectonic differential settlement of cratonic basin and a series of uplifts and troughs.
引文
[1]Michel T H.Giant fields 1868-2003,in CD-ROM of giant oil and gas fields of the decade,1990-1999[J].AAPG Memoir,2003,78:123-137.
    [2]杜金虎,王招明,李启明,等.塔里木盆地寒武—奥陶系碳酸盐岩油气勘探[M].北京:石油工业出版社,2010.
    [3]王一刚,文应初,张帆,等.川东上二叠统长兴组生物礁分布规律[J].天然气工业,1998,18(6):10-15.
    [4]周新源,王招明,杨海军,等.塔中奥陶系大型凝析气田的勘探和发现[J].海相油气地质,2006,11(1):45-51.
    [5]王宓君,包茨,李懋钧,等.四川油气区:中国石油地质志[M].北京:石油工业出版社,1989.
    [6]王一刚,洪海涛,夏茂龙,等.四川盆地二叠系、三叠系环海槽礁、滩富气带勘探[J].天然气工业,2008,28(1):22-27.
    [7]Zhao W Z,Xu C C,Wang T S,et al.Comparative study of gas accumulations in the Permian Changxing reefs and Triassic Feixianguan oolitic reservoirs between Longgang and Luojiazhai-Puguang in the Sichuan Basin[J].Chinese Science Bulletin,2011,56(31):3310-3320.
    [8]汪泽成,赵文智,彭红雨.四川盆地复合含油气系统特征[J].石油勘探与开发,2002,29(2):26-28.
    [9]罗志立.峨眉地裂运动和四川盆地天然气勘探实践[J].新疆石油地质,2009,30(4):419-424.
    [10]罗志立,孙玮,韩建辉,等.峨眉地幔柱对中上扬子区二叠纪成藏条件影响的探讨[J].地学前缘,2012,19(6):144-154.
    [11]宋鸿彪,罗志立.四川盆地基底及深部地质结构研究的进展[J].地学前缘,1995,2(4):231-237.
    [12]姚军辉,罗志立,孙玮,等.峨眉地幔柱与广旺—开江—梁平等拗拉槽形成关系[J].新疆石油地质,2011,32(1):97-101.
    [13]卓皆文,王剑、汪正江,等.鄂西地区晚二叠世沉积特征与台内裂陷槽的演化[J].新疆石油地质,2009,30(3):300-305.
    [14]王英民,童崇光,徐国强,等.川中地区基底断裂的发育特征及成因机制[J].成都地质学院学报,1991,18(3):52-60.
    [15]殷积峰,谷志东,李秋芬.四川盆地大川中地区深层断裂发育特征及其地质意义[J].石油与天然气地质,2013,34(3):376-382.
    [16]Li Q F,Wang Z C,Li J,et al.Discovery of Yanting-Tongnan trough of Late Permian in Sichuan Basin and its significance[J].Journal of Earth Science,2012,23(4):582-596.
    [17]Wilson J L.Carbonate Facies in Geologic History[M].New York:Springer-Verlag,1975.
    [18]Read J F.Carbonate platform facies models[J].AAPG Bulletin,1985,69(1):1-21.
    [19]Tucker M E,Wright V P.Carbonate Sedimentology[M].London:Blackwell Science,1990.
    [20]王一刚,文应初,洪海涛,等.四川盆地及邻区上二叠统—下三叠统海槽的深水沉积特征[J].石油与天然气地质,2006,27(5):702-714.
    [21]杨玉卿,冯增昭.中国南方二叠纪沉积体系[J].古地理学报,2000,2(1):11-18.

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